10x Delta FFB1424SHG fans - HUGE CFM! 281cfm @ 24v but can be ran from 8v to 31v AND these are PWM fans so you can run them super low speed or crank them up to blazing fast whenever you want. can be motherboard controlled or manually controlled.... you choose. - $20 each http://img.techpowerup.org/110602/Capture077.jpg